The
most efficient linear air compressors & diaphragm pumps for pond aeration
and other applications where clean, constant oilless air is requiredWe use mainly
these three models of small linear diaphragm pumps and cheap pond
pumps so please take the time to understand the limitations and benefits
of each one. If you have any questions or need help we will be glad
to assist you!

Understanding the concept of building the perfect aeration system
means having a basic understanding of the various air pumps, blowers
and compressors that are available. The compressor or pump you choose
will require some understanding and knowledge as to what you need
the pump to do. Every pond diffuser, every length of airline, and
every airstone connected to your compressor will require a specific
CFM (cubic feet per minute) of airflow as well as a required PSI (pounds
per square inch) to overcome the head-loss and internal friction of
every foot of tubing and the specific resistance inherent in the diffuser
system being used.

One important factor in choosing a silent linear air pump or diaphragm
pump is to understand that it requires 1 PSI to push air bubbles to
a depth of 28" or 2.3 feet deep. So if your pond averages 6 feet
deep then before you even consider the number of diffusers or thetype
of diffusers to be used you have to ensure your electric linear air
compressor can deliver at least 2.6 PSI. But be careful because each
diffuser, whether it is a diffuser disc, an airstone or some sort
of homemade diffuser that you want to hook up to your cheap pump,
all of them will have a certain resitance that will add pressure requirements
to your formula. A single membrane disc diffuser for example can add
an extra 12 inches of virtual depth (this means that every disc in
your aeration system will demand an extra 0.42 PSI on your compressor)
while a high-efficiency glass-bonded diffuser only have a registered
air resistance of less than 0.25 PSI.

Linear
Piston Air PumpsPrice
Includes USA ShippingThese are not linear "diaphragm," but
true linear "piston" type pumps. Since the only moving part—the
piston—floats on a bed of air, a exceptionally long service
life can be expected. More
Info

57
LPM Linear Piston Pump2.0 CFM 3 PSI max - $360

85
LPM
Linear Piston Pump3.0 CFM 4 PSI max - $450

160
LPM
Linear Piston Pump5.7 CFM 4 PSI max - $600

Diaphragm
Air PumpsPrice
Includes USA ShippingThese sturdy, reliable, very quiet pumps
will provide a long service life. Built for outdoor use, The
diaphragm air pumps deliver oil-free air with a maximum pressure
of 4 psi. Each pump has a 3/4" barb outlet and grounded power
cord (6 ft). More
Info

50
LPM Diaphragm Air Pump1.8 CFM 4 PSI max - $325

82
LPM
Diaphragm Air Pump2.9 CFM 4 PSI max - $355

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If
you are considering one of these compressors then you likely are not
running long lengths of tubing...most of these low pressure systems
can pump air through standrad 3/8" and 5/8" for small distances
from 50 or 200 feet depending on the compressor.

It is only when you need a compressor to push air through several
hundred feet of airline you need to cinsider the line loss calulation
of airline which is the amount of pressure and friction that builds
up against the walls of the tubing and the associated loss of pressure.
This means that in a length of 200 feet of tubing you might require
an extra 2 PSI to overcome the air volume friction based on the inner
diameter of the tubing.
Linear Diaphragm Air Pumps
With a higher PSI output and much lower watts than any pond pump or
compressor on the market these cheap air compressors have become our
favorites when the pressure requirements are beyond the WhiteH20
models listed above. With the smart and efficient motors in these
UL-Listed and CE-Approved pumps, pond aeration systems just keep getting
easier and any home-made do-it-yourself aeration system will be trouble-free
with with these long-lasting and powerful linear air pumps.

The linear air pumps used by ThePondReport.com average about 40% more
airflow and about 20% lower 110/115 V power consumption than similar
models. 230V is also available for the same price. Specify your power
needs by email when ordering. You will see similar looking air pumps
imported from Asia like pumps from China or Tiawan Made pumps but
the SweetH20® brand is significantly different and while we don't
want to insult any manufacturer...these pumps are the best available!.
These are designed for 60-Hz (North American) operation to produce
maximum efficiency. These linear compressors model permit continuous
operation exceeding 3 years in normal continuous usage.

The only maintenance
required is minimal: Simply clean the air inlet filter as needed with
a few sharp breaths, a vacuum passage or according to the included
instrcution manual. As with all of our oiless pond aeration air pumps
there is no need for lubrication, and the included outlet air is always
clean. Besides being ultra-efficient they are also super-quiet. These
units are often found in University classrooms, pet store or laboratory
or anywhere, including the pond, where clean efficient pumps are a
must!

Each long-lasting pump uses a heavy, cast-aluminum, drip proof housing.
Standard models are 115V/60 Hz with 6' power cords. UL-listed and
CE-approved. Three-year warranty (does not include filters or diaphragm).
Available in 230 V and 50 Hz by special order only. To maximize the
life of these linear compressors it is best to keep the unit in a
shed or build a small structure like a doghouse to hold it from the
elements.

By operating your pump within the correct pressure range (we like
to stay about 25% less than the maximum PSI rating of the model) you
will greatly reduce the need for changing diaphragms, heads or valves.
Purchasing a repair kit, despite your best installation intentions,
is not a bad idea. If all parameters of the pumps are respected you
may need to change the diapghrams once every 24 to 48 months but it's
easier to have one on hand in your tool-shed instead of buying your
repair kit online after a break-down as often fish don't take a fancy
to being a week without air! Because these pumps have an available
repair kit they are our highest reviewed pond aeration pump.Linear Piston Air Pumps

These are not linear
"diaphragm," but true linear "piston" type pumps. Since the only moving
part—the piston—floats on a bed of air, a exceptionally long service
life can be expected (8 years of continuous life is not uncommon).
You will experience exceptionally quiet, energy-efficient operation
and clean, oil-free air. An outdoor-rated housing, a grounded power
cord, 3/4" hose barb and 115V/60 Hz are all standard. UL-listed. One-year
warranty.

• Extremely quiet.
• Outdoor-rated housing.
• True linear piston.
• Exceptionally long service life.
• Outstanding energy efficiency. Diaphragm Air PumpsThese tough air compressors can feed
1 to 5 pond diffusers or airstones (according to CFM requirements)
in a pond up to 8 feet deep. Best longevity is delivered when operating
pressure is between 2.2 and 3.5 PSI ...see the operating curve chart
below to design your homemade aeration system using these pumps or
send us an email with questions. Run one or more diffusers
or airstones with these pumps!

I have so many clients ask where to get a long lasting air pump to
run a few diffusers and have found a good line of imported, outdoor
rated air pumps and I finally found a line that I think outperforms
many models that I have reviewed.

These are sturdy, very reliable, and quiet air pumps that will provide
a long service life and they have a two-year warranty which isn't
bade because I've tried many diaphragm pumps that seem to need a diaphragm
repair kit every 6 months! Built for outdoor use, keep it protected
to prolong the average life-expectancy. You don't need anything fancy;
just build a small box, preferably with ventilation (small fan) to
keep your pump out of the snow, rain and away from the gnawing teeth
of muskrats, beavers or other pond creatures. They are designed for
outdoor use but why not protect your investment?

WhiteH20™ pumps deliver a more-than-modest output from 1.8 to 7.9
cfm (50 to 223 lpm) of oil-free air with a maximum pressure of 4 psi.
Remember that each 2.3 feet of water is 1 PSI so with a max dishcharge
of 4PSI you can pump air to a maximum of 9 feet with the larger
model...but this doesn't include resistance from the diffusers you
are using or the friction loss from the tubing etc. Each pump has
a 3/4" barb outlet and grounded power cord (5 ft). UL-listed. Two-year
warranty.

Use the specification curves of each model pump to determine how many
diffusers can be used with each pump as each type of diffuser (silica
bonded stone, membrane, pourous granite) will have varying resistance.

SECOH
Air Pumps
Popular Models Include: EL-60, EL-80, EL-120W, EL-150, EL-220
The SECOH line of pumps is very popular in Europe but is now
available in USA and Canada as well. The best price for a EL-60
is $275, the 80-17 is $325. Known to wear out wuickly if the
max pressure reatings are surpassed the warranty is only one
year.

Conversion
guide/calculator : 1 l/min = 0.06 m³/hr, 1 m³/hr = 16.7 l/min
100mbar = 1m water depth Air Delivery : Please note that 'Open
Flow' relates to the maximum air delivery with nothing connected
(!) .. to calculate the actual air delivery at any given depth
download the appropriate datasheet from our 'Free Downloads'
section. All SLL & EL range pumps come with a European Schuko
plug which can be cut off for direct wiring or an adapter can
be supplied with a fused European to UK plug adapter. Euro price
shown is fixed at x1.30. Actual price will be at the correct
conversion on checkout. VAT is not a component of the price
shown as Parts and Pumps is not currently VAT registered so
does not claim or charge VAT. EL-120 W Secoh Pump EL120 W Twin
Linear Compressor Optimal Pressure - 0.25bar Open Flow - 225
l/min Sound Level - 39 db(A) Max Power - 131w @ 200mbar Dims
(LxWxH) - 268.5x357x228(mm) Connection - 27mm Ø Net Weight -
16kg see download section for more information Key Features
: Same spares kit for both heads Optional outlet ports (New!)
Lesser load and longer predicted lifetime using 2 heads and
should one head stop you still get 50% airflow We recommend
the purchase of a pressure relief valve SE11 with this pump
to avoid over pressurisation. click to see larger image Price:
£358.00 [€465.40]

AL-15A -- $119.75 Power: 17W Output: 20 lpm (liters per minute)
@ 1.4 psi - Typically good for at least 20-25 aquarium air outlets,
variable depending on tank depth and the amount of air desired
at each outlet. AL-40 -- $169.75 Power: 46W Output: 48 lpm @
2.18 psi - Typically good for at least 50-60 aquarium air outlets,
variable depending on tank depth and the amount of air desired
at each outlet. AL-60 --$145.75 Power: 60W Output: 68 lpm @
2.18 psi - Typically good for at least 65-75 aquarium air outlets,
variable depending on tank depth and the amount of air desired
at each outlet. AL-80 -- Buy it for $337.75 Power: 85W Output:
85 lpm @ 2.18 psi - Typically good for at least 80-95 aquarium
air outlets, variable depending on tank depth and the amount
of air desired at each outlet. The new style AL-80 takes the
Al-80/120 repair kit. The new style pumps are apple green in
color. The old style AL-80 takes the AL-60/80 repair kit. AL-120
Power: 124W Output: 130 lpm @ 2.9 psi - Typically good for at
least 125-145 aquarium air outlets, variable depending on tank
depth and the amount of air desired at each outlet.

ALITA Linear Air Pump Download Literature Designed to deliver
high volume of steady airflow at low-pressure ranges, ALITA
Linear Air Pumps are of high efficiency, low energy consumption
and perform with low operation noise. With no sliding parts
and oil-less components, ALITA air pump requires no lubrication
and transfer air without any contamination. In addition to a
wide range of standard pump models that can be utilized off
shelf, we also offer OEM and customized linear air pumps to
industry for original equipment application. OEM business demands
reliability, performance, efficiency and customer satisfaction.
Let ALITA linear air pumps be a part of your product solution.
Product Features Steady airflow Oil free, no contamination or
pollution Reliable intermittent or continuous duty operation
Long service life Quiet and low vibration Low energy consumption
Compact design and solid construction Indoor or outdoor operation
Thermal protection Simple maintenance Applications Aeration
Air purification Air sampling Bubble bath Gas analyzer Liquid
agitation Medical and scientific equipments Pneumatic beds;
air mattresses Wastewater treatment; aerobic treatment Various
industry

RoHS Compliant RoHS Compliant = Pb-Free = Green Alita Linear
Air Pump introduced from 2006 onward will meet the Restriction
of Hazardous Substances (RoHS) compliance directive of the European
Union. The full description of this legislation, commonly called
RoHS, is "Directive 2002/95/EC of the European Parliament and
of the Council of 27 January 2003 on the restriction of the
use of certain hazardous substances in electrical and electronic
equipment. The directive requires manufacturers to significantly
reduce lead, mercury, hexavalent chromium, cadmium, polybrominated
biphenyls (PBB), and polybrominated diphenyl ether (PBDE) content
in electronics and electrical products sold in the EU beginning
in July 2006. Alita developed an internal compliance team to
direct these efforts and implement RoHS compliance under the
EU directive. Alita implemented aggressive timelines to meet
requirements in advance of the July 2006 compliance date and
will continue to work closely with key customers on their specific
requests. Available
at: ww.alita.com

LINEAR
air pumps from Malibu Water

Linear 40 - for aeration of small septic tanks and water tanks
of 500 gallons or less. - $350 for complete system with 20'
of 3/16" air line and diffuser. Linear 80 - for aeration of
medium septic tanks and water tanks of 1000 gallons or less.
- $450 for complete system with 20' of 3/16" air line and diffuser.
Linear 120 - for aeration of large septic tanks and water tanks
of 3000 gallons or less.- $650 for complete system with 20'
of 3/16" air line and diffuser. 1 acre pond aerator - The economical,
oil-less 905, 1/15 hp but fully capable to aerate a 1 acre pond
completely - $350 w/ 100' of 3/8 air line and a lake bed diffuser.
3 acre pond aerator - large, heavy duty 1/4 hp oil-less air
pump, 110AC, w/ 100 of 3/8" air line and lake bed diffuser.
- $450 Note - the linear pumps are quieter than the oil-less
piston pumps. A waterproof and sound dampening case is available
for the above pumps @ $100 if needed. All repair parts are available
for these pumps which all come with a one years manufactures
warranty. There are no timers, fans, etc needed for these pumps.
They are designed to run 24/7 for years. Koenders - 3 acre pond
aerator w/ heavy duty water proof case - $650. This is a very
heavy duty aerator made for farmers and ranchers. It weighs
about 100 pounds. It is a bit noisy but a sound dampening case
which can be buried is available @ $100 if needed. This pump
will last for years, has a 1 year warranty, parts are available
and we have sold thousands of them. Again, no timers, fans,
etc. It is designed for running 24/7. It comes with 100' of
air line and a lake bed diffuser.

QUIET AERATION - if quiet operation is necessary for any aeration
project and you have 110AC available, we have fitted a submersible
water pump into one of our large lake bed aerators that will
drive the bottom water to the top of the surface....where the
real aeration occurs. Not using air bubbles to lift the water
does reduce the air exchange slightly but the pond is aerated
very well with lots of water action at the surface thus providing
all the usual aeration benefits. BACTERIA - We all run on bacteria...including
our ponds. If you have a very bad algae or hydrogen sulfide
problem that needs immediate attention, we can supply a 5 pound
block of bacteria designed for nutrient removal in ponds. Put
the block into our Lake Bed Aerator and the rising air bubbles
will carry the bacteria into all of the pond water. The block
will last about one month...which is about the amount needed
to clean out a 2 acre pond. After the block is gone, just keep
the air going. The good aerobic bacteria are there doing the
job....eating all the algae's food....and replacing all the
anaerobic bacteria that produce the Hydrogen sulfide. 5 pound
block of Pond Bacteria - $50. Lake Bed Aerator - $350 Available at: www.malibuwater.com